<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <div id="name">
        <p>{{username}}</p>
        <input type="text" v-model="username">
        <br>
        <input type="text" :value="username">
    </div>
<script src="lib/vue-2.6.12.js"></script>
<script>
    const vm=new Vue({
        el:'#name',
        data:{
            username:'sb'
        },

    })
</script>
</body>
</html>